Phacellophora camtschatica, known as
the fried egg jellyfish or egg-yolk
jellyfish, is a very large jellyfish, with a bell up to 60 cm (2 ft) in
diameter and sixteen clusters of up to a few dozen tentacles, each
up to 6 meters (20 ft) long. This cool-water species can be found
in many parts of the world's oceans. It feeds mostly on smaller
jellyfish and other gelatinous zooplankton, which
become ensnared in the tentacles (Strand & Hamner, 1988).
Because the sting of this jellyfish is so weak, many small
crustaceans, including larval crabs (Cancer
gracilis) and Amphipoda, regularly ride on its bell and
even steal food from its oral arms and tentacles (Towanda &
Thuesen, 2006). The life cycle of this jellyfish is well known
(Widmer 2006), because it is kept in culture at the Monterey Bay Aquarium. It
alternates between a benthic stage that is attached to rocks and
piers that reproduces asexually and the planktonic stage that
reproduces sexually in the water column; there are both males and
females in the plankton.

A smaller jellyfish, Cotylorhiza tuberculata,
typically found in warmer water, particularly in the Mediterranean
Sea, is also popularly called a fried egg jellyfish.